WHAT IS ZODIAC

Sun Sign

Aries
Taurus
Gemini
Cancer
Leo
Virgo
Libra
Scorpio
Sagittarius
Capricorn
Aquarius
Pisces
The sky as seen from earth appears as a sphere with earth as its centre. This hypothetical sphere is called Celestial Sphere or Celestial Globe.
Our solar system is very very small as compared to our universe. The distances of stars seen in the sky are so huge that they hardly appear changing their positions in the celestial sphere even in thousands of years. In other words the celestial sphere appears like a black hollow sphere on which is stars are fixed on its surface from inside. Obviously the structure made by stars practically does not change with time.

Since the planets of our solar system including Sun and Moon are comparatively much nears, they can be seen moving in the Celestial Globe. Because our earth moves around the Sun on almost a circular path, the Sun appears moving around the Earth on a circular path on the Celestial Sphere from west to east. All the other planets (Grah) also appear moving along this circle from west to east, on a 9 degree wide path, which is called Zodiac.

What are Signs i.e. Rasis

The 360 degrees of the Zodiac is divided into 12 signs or Rasis, each having 30 degrees, as indicated below:

Rasi No.

Degree

Rasi / Sign

Lords of Rasi

Greater than or equal to

Less than

1

0

30

Mesh / Aries

 Mars

2

30

60

Vrishabh / Taurus

 Venus

3

60

90

Mithun / Gemini

 Mercury

4

90

120

Kark / Cancer

 Moon

5

120

150

Simha / Leo

Sun 

6

150

180

Kanya / Virgo

 Mercury 

7

180

210

Tula / Libra

 Venus 

8

210

240

Vrishchik / Scorpio

 Mars 

9

240

270

Dhanu / Sagittarius

Jupiter 

10

270

300

Makar / Capricorn

Saturn 

11

300

330

Kumbh / Aquarius

Saturn

12

330

360

Meen / Pieces

Jupiter 

According to Indian Astrology, the sign(rasi) in which Moon is sitting at the time of birth, is called the sign(rasi) of that person, however, western astrology gives more importance to Sun, Hence, as per Western Astrology, the risi(sign) in which Sun is sitting at the time of birth is called the sign(rasi) of that person.
The Rasis (Signs) are recognized by the structure made by the stars on that part of zodiac and their names are also given as the structure appears.
The starting point of the zodiac is start of first sign(rasi) i.e. Mesh(Aries). In Nirayan System this point is fixed with stars. While in the Sayan sytem this point is moved with change in the inclination of zodiac. Rate of change in this inclination is very slow. It takes 72 years to move 1 degree. Indian Astrology follows Narayan System while west follows Sayan system. At present there is around 23 degree difference beteen the two systems. It is why you may see around 22/23 days difference in sun sign used by this site as compared to saayan system(western system).